Is there a pin-compatible replacement for SMNR8040-680MT?

No pin-compatible (same 8040 package and footprint) replacement was identified among the candidates. All functional alternatives require a change in the PCB layout due to different package sizes.

What risks should I check before replacing SMNR8040-680MT?

Key risks include: 1) Package Mismatch: Verify the substitute's footprint and height are compatible with your board layout. 2) DCR: A higher DC Resistance will increase power loss and heat. 3) Saturation Current (Isat): Ensure the replacement's Isat meets or exceeds the 1.45A requirement under all operating conditions.

SMNR8040-680MT Alternatives, Datasheet & Cross Reference | SXN

Finding a substitute for the SMNR8040-680MT 68µH inductor involves balancing electrical performance and physical size. While several alternatives offer higher current ratings, they often come in different package sizes, requiring board layout adjustments.

AI replacement insight

Package riskhigh

All viable alternatives have different footprints, requiring PCB redesign.

Electrical riskmedium

Some alternatives have higher DCR, impacting efficiency. Must verify Isat and DCR.

Sourcing risklow

Multiple manufacturers offer 68µH inductors, but package/performance combinations vary.

Can it be replaced directly?

No direct drop-in replacement was found. All candidates with matching inductance have different package sizes.

Best replacement path

Functional alternate with board redesign.

Main risk

Package incompatibility is the primary risk, as no reviewed alternatives share the target's 8040 footprint.

Recommended alternatives

Strong electrical alternative with higher current rating, but its larger package requires a board layout change.

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Alternative comparison matrix

Feature / factor	SMNR8040-680MT	SMMS1050-680M	SMMS1350-680M	SMDRH104R-680MT	Compatibility / risk
Inductance	68 µH	68 µH	68 µH	68 µH	68 µH — Inductance matches target.; SMMS1350-680M: Inductance matches target.; SMDRH104R-680MT: Inductance matches target.
Current	1.45 A	3.0 A	4.5 A	2.08 A	3.0 A / 4.5 A / 2.08 A — Higher saturation current provides more margin.; SMMS1350-680M: Significantly higher saturation current.; SMDRH104R-680MT: Higher saturation current.
Resistance	196 mΩ	190 mΩ	135 mΩ	213 mΩ	190 mΩ / 135 mΩ / 213 mΩ — Slightly lower DCR is a minor improvement.; SMMS1350-680M: Lower DCR improves efficiency.; SMDRH104R-680MT: Higher DCR will increase power loss.
Package	8040 (8x8mm)	1050 (10.5x10.2mm)	1350 (13.8x12.6mm)	10.3x10.3mm	1050 (10.5x10.2mm) / 1350 (13.8x12.6mm) / 10.3x10.3mm — Package is larger and not a drop-in fit.; SMMS1350-680M: Package is significantly larger and not a drop-in fit.; SMDRH104R-680MT: Package is larger and not a drop-in fit.

Application & sourcing insights

Questions & answers

For applications that can accommodate a larger footprint, SMMS1350-680M offers superior current handling (4.5A) and lower resistance (135mΩ). However, no direct drop-in replacement with identical or better specs in the same 8040 package was found in this review.